Heat treatment process of diamond blade
Diamond blades are mainly used for cutting hard and brittle marble, and it is one of the main tools for producing natural stone. Diamond blades are made by welding diamond blades on a circular substrate.
For diamond blades to be cut normally, the substrate must have a certain strength, and at the same time it must not be too soft, and must have a certain bending stiffness, which is comprehensively reflected in the need for sufficient strength. Another key feature of the substrate is There are obvious vibrations in use, because the blade is thicker than the substrate, and there is a certain gap between the substrate and the cut marble during operation. In order not to cause the substrate to be forced to compress or fatigue due to vibration, the substrate must be It has certain plastic ductility, high fatigue strength and ductility limit, so as to have the effect of alleviating impact and absorbing vibration.
It can be seen from the specifications of the diamond blade matrix that in order to achieve the ductility limit and strength index of the matrix, for the diamond blade with 65Mn as the matrix material, the heat treatment method should be medium temperature quenching. However, the quenching of the diamond blade matrix has a very prominent characteristic, that is, the quenching deformation and the cracking selectivity are large.
The reason for the deformation
1. Whether the heating is in a gas or salt bath, the thermal convection will more or less cause impact on the substrate and cause heating deformation.
2. Refrigeration Because the cooling rate of each part of the cross-section is different, the temperature difference will cause the volume of the steel to shrink unevenly, which will cause the generation of internal stress. In addition, during quenching, the whole process of changing the low-temperature martensite to austenite of the steel With the transformation of the specific volume, the change and deformation of the stress of the mechanism are caused.
There are many factors that cause cracks, such as steel composition, raw material defects, initial group, heating factors, cooling factors, and the unique structural characteristics of the blade, resulting in various stress concentrations in the holes in the sheet, especially the large tensile stress nearby. Breakthroughs and the like are potential factors for cracks.
The physical properties of the diamond blade matrix have a great impact on its quality and performance indicators, and the heat treatment method of the matrix is a key factor affecting its physical properties.
